<template>
  <view>
    <view class="search_box">
      <uni-search-bar @input="input" :radius="100" cancelButton="none" />
    </view>
    <view class="sugg-list" v-if="searchResults.length !== 0">
      <view class="sugg-item" v-for="(item, i) in searchResults" :key="i" @click="gotoDetail(item.goods_id)">
        <view class="goods-name">{{item.goods_name}}</view>
        <uni-icons type="arrowright" size="16"></uni-icons>
      </view>
    </view>
    <!-- 搜索历史 -->
    <view class="history-box" v-else>
      <!-- 标题区域 -->
      <view class="history-title">
        <text>搜索历史</text>
        <uni-icons type="trash" size="17" @click="cleanHistory"></uni-icons>
      </view>
      <!-- 列表区域 -->
      <!-- 这里的跳转让我觉得挺奇怪的 -->
      <view class="history-list">
        <uni-tag :text="item" v-for="(item, i) in historys" :key="i" @click="gotoGoodsList(item)"></uni-tag>
      </view>
    </view>
  </view>
</template>

<script>
  export default {
    data() {
      return {
        timer: -1,
        kw: '',
        searchResults: [],
        historyList: []
      }
    },
    computed:{
      historys(){
        return [...this.historyList].reverse()
      }
    }
    ,
    onLoad() {
      this.historyList = JSON.parse(uni.getStorageSync('kw') || '[]')
    },
    methods: {
      input(e) {
        clearTimeout(this.timer)
        this.timer = setTimeout(() => {
          // console.log(e)
          this.kw = e
          this.getSearchList()
        }, 500)
      },
      async getSearchList() {
        if (this.kw === '') {
          // 一开始觉得这个置空的语句可以省略，因为一开始本来就是空的嘛，但是如果前一次有值了，后一次就没办法置空了。所以还是得写
          this.searchResults = []
          return
        }
        
        
        const {
          data: res
        } = await uni.$http.get("/api/public/v1/goods/qsearch", {
          query: this.kw
        })
        // console.log(res)
        if (res.meta.status != 200) return uni.$showMsg()
        this.searchResults = res.message
        this.saveSearchHistory()
      },
      gotoDetail(goods_id){
        uni.navigateTo({
          url:"/subpkg/goods_detail/goods_detail?goods_id="+goods_id
        })
      },
      saveSearchHistory() {
        const set = new Set(this.historyList)
        set.delete(this.kw)
        set.add(this.kw)
        this.historyList = Array.from(set)
        // 调用 uni.setStorageSync(key, value) 将搜索历史记录持久化存储到本地
        uni.setStorageSync('kw', JSON.stringify(this.historyList))
      },
      cleanHistory(){
        this.historyList=[],
        uni.setStorageSync('kw','[]')
      },
      // 这个地方的跳转我觉得真的挺奇怪的，不应该就直接给kw赋值就可以了吗，为什么是跳转商品列表。
      gotoGoodsList(kw){
        uni.navigateTo({
          url:"/subpkg/goods_list/goods_list?query="+kw
        })
      }
    }
  }
</script>

<style>
  .search_box {
    position: sticky;
    top:0;
    z-index: 999;
  }

  .sugg-list {
    padding: 0 5px;
  }

  .sugg-item {
    font-size: 12px;
    padding: 13px 0;
    border-bottom: 1px solid #efefef;
    display: flex;
    align-items: center;
    justify-content: space-between;
  }

  .goods-name {
    // 文字不允许换行（单行文本）
    white-space: nowrap;
    // 溢出部分隐藏
    overflow: hidden;
    // 文本溢出后，使用 ... 代替
    text-overflow: ellipsis;
    margin-right: 3px;
  }
  .history-box {
    padding: 0 5px;
  }
  .history-title {
      display: flex;
      justify-content: space-between;
      align-items: center;
      height: 40px;
      font-size: 13px;
      border-bottom: 1px solid #efefef;
  }
  .history-list {
      display: flex;
      flex-wrap: wrap;
  }
  .uni-tag {
    margin-top: 5px;
    margin-right: 5px;
  }
</style>
